No, Harry Potter is not an Autobot fanfiction. Harry Potter is a distinct fantasy series centered around magic, wizards, and the wizarding world created by J.K. Rowling. It has no relation to the Autobots which are from the Transformers franchise.
There might also be other Autobots such as Bumblebee. Bumblebee could be Harry's friend, always there to help him out in tight situations. Maybe there's a human - Autobot liaison character who helps Harry understand the Autobots better. And let's not forget, there could be some antagonists from either the wizarding world or the Decepticons' side who play important roles in driving the story forward.
Well, an Autobot male OC could be really brave. Like he would never back down from a fight against the Decepticons, always ready to protect the weak. He might also be very loyal to his Autobot comrades, standing by them through thick and thin.
Well, one possible interesting plotline could be Harry teaming up with the Autobots to fight a common enemy. Maybe there's a powerful Decepticon that threatens both the wizarding world and the Autobots' home planet, and Harry's magic combined with the Autobots' technology is the key to victory.
One possible storyline could be that after years of war, an Autobot and a Decepticon realize the futility of their fight. They secretly meet and start to communicate. They find that they both have similar desires for their home planet, Cybertron. So they decide to work together to bring about peace, facing opposition from both their factions.
One interesting Naruto Autobot fanfiction could be about Naruto somehow getting transported to the Transformers' universe and teaming up with the Autobots. He might use his ninja skills in combination with the Autobots' advanced technology to fight common enemies.
There was an Autobot male OC, named Steel. Steel was not your typical Autobot. He was smaller in size compared to others but had a heart full of courage. He was an expert in fixing damaged Autobots. In a major battle, many Autobots were severely injured. Steel worked tirelessly to repair them. He faced challenges as the Decepticons were constantly trying to stop him. But with his quick thinking and determination, he managed to keep his comrades in fighting shape, earning the respect of all Autobots in the process.
One possible theme could be redemption. The autobot might help the suicidal reader find a reason to live, like showing them the value of life in a new way.
Kakashi could be another important character. His intelligence and wide range of ninja techniques can bring a different aspect to the story. And for the Autobots, Ratchet is often used. His role as a medic can be interesting when combined with the ninja's healing techniques in Naruto.
Starscream could also be a main villain in this fanfic. He is always looking for a chance to gain power and prove himself. He might see the battle of Autobot City as an opportunity to take over the Decepticons or get some valuable Autobot technology for his own gain.